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Northern Prairie Star Party Black Nugget Lake September 15, 2012 . Brian Martin The King’s University College. Three Fundamental “Sciences”. Measuring “Distance”, Position & “Scale”  Astrometry Measuring Brightness and Intensity  Photometry Measuring “Colour”  Spectroscopy.

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Northern Prairie Star Party Black Nugget Lake September 15, 2012

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Northern prairie star party black nugget lake september 15 2012

Northern Prairie Star Party

Black Nugget Lake

September 15, 2012

Brian Martin

The King’s University College


Three fundamental sciences

Three Fundamental “Sciences”

  • Measuring “Distance”, Position & “Scale”  Astrometry

  • Measuring Brightness and Intensity  Photometry

  • Measuring “Colour”  Spectroscopy

Exciting science that you can do from the back yard!


Astrometry

Astrometry

August 29, 2012

H-alpha filter

0.001 s exposure

ED80

Atik 314L+ camera

TKUCO

How big are the lunar features in this image?


Some math

Some Math …

S

R

q

  • The Small Angle Formula Rq* = S where:

    • R = distance from object

    • q = angle that the object subtends in the sky

    • S = distance across the object

* Angle in radians


The scale of your telescope

The Scale of Your Telescope

  • Scale in (seconds of arc)/mm found by:

  • In the previous image a ED80 telescope was used so the scale is (206265)/(600 mm) = 343.8 “/mm

  • The Atik 314L+ has 6.45 mm pixels, so each pixel has a scale of 342.8”/mm × 0.00645mm/px = 2.22 “/px when used with the ED80

  • By measuring the number of pixels you can measure the angle that an object or feature subtends


Northern prairie star party black nugget lake september 15 2012

304 px = 1236 km

850 px = 3457 km

(0.5% error)


Some other images

Some other images…

  • Capuanus Crater:

    • December 26,2009

    • C14, f/11

    • Imaging source DMK2104

    • 2000 frames

    • Scale = 0.20”/px

    • Distance = 0.002523 AU


Northern prairie star party black nugget lake september 15 2012

  • Apennines (Eratsothenes, Archimedes)

    • March 1, 2012

    • C14, f/7

    • Atik 314L+

    • 20 frames (0.005 s)

    • Scale = 0.52”/px

    • Distance = 0.00262 AU


Northern prairie star party black nugget lake september 15 2012

  • Jupiter

    • November 5, 2011

    • C14, f/11

    • Imaging Source DMK2104

    • LRGB (~2000 frames each)

    • Scale = 0.26”/px


Northern prairie star party black nugget lake september 15 2012

  • M57

    • August 26, 2011

    • C14 f/7

    • ST7E

    • LRGB

    • Scale 1.49”/px

    • Distance = 2300 ly


Northern prairie star party black nugget lake september 15 2012

  • M15

    • August 21, 2011

    • C14 f/7

    • ST7E

    • LRGB

    • Scale 1.49”/px

    • Distance = 33 Kly


Photometry measuring changes in brightness

Photometry – Measuring Changes in Brightness

  • Intrinsic Variables

    • dScuti

    • SX Phe

  • Novae and Supernovae

  • Cataclysmic Variables


Consumer grade ccd cameras

Capable of doing excellent science!

Modest cost (< $2000)

Excellent software support

Monochrome with no anti-blooming is preferred

Pixel size should be carefully matched to image scale – need to oversample

Capable of milli-magnitude precision photometry

Consumer grade CCD cameras…

Atik 314L+

SBIG ST7E


Sx phoenicis variables

SX Phoenicis Variables

  • BL Camelopardalis

    • Average mag 13.1

    • Period

      • 0.0389d

      • 56 minutes – this is an exciting system to watch!!

40 s integration, C14 f/7

ST7E camera – KAF400 detector


The light curve

The Light-Curve…

November 9, 2009

BL Cam

Teff 7730 K

Age ~4Ga

Metal poor

Period shows a

Small change over time!

November 9, 2009, s (C2-C1) = 0.007 mag


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